Guy i worked with back in 79 had a blue metalflake custum paintjob 440 6pack chall. with all 3 acelerator pumps. The fat queer never got on it once for me. He bought it that way. My aluminum 69 int had mechanical linkage back then with 1 acc. pump. Talk about a bog. Fat boy said his didnt bog.
One day in a old crappy jyard, i spotted a vacumn pod sticking out of the mud in the main road. They gave it free too me. Was a 340-6 end. I bought all new link, lines, 2 bowls and vac. pod back in 95 from place in albaturkey, nm. All rebuilt, still sitting in closet.
Back in 95, i also took a holley 2 bbl and cut the horn into the d shape. I will test it replacing the ctr. carb. A few years ago , a few people on moparts used same thing, 500cfm for the ctr. and said they it helped drop a few tenths.
Too use that carb with vac. ends, i will have too drill a kill bleed into the venturi like the 350 ctr. The 500 doesnt have one. Also , can switch base plates. I think the 950 hp is really a 750 with a 850 base? Maybe try the 500 base on 350. Next i need the new end plates with regular jets. Anyone know if yuo can buy new end floats?
I have magazine article showing step by step all photos of a ga. dentist converting vac. carbs to all 3 acell. pumps.